Doughnut box blank



FIG. 1 is a perspective view of a doughnut box blank showing my new design; and,

FIG. 2 is a top plan view thereof, the bottom view being a mirror image.

The doughnut box blank is constructed of material of conventional thickness, and the dash lines in the drawing represent fold lines. 

The ornamental design for a doughnut box blank, as shown and described. 